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Q.

The electronic configurations of Eu (AtomicNo. 63), Gd (Atomic No. 64) and Tb (AtomicNo.65) are :

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a

 [Xe]4f65d16s2, [Xe]4f75d16s2 and[Xe]4f85d16s2

b

 [Xe]4f76s2, [Xe]4f75d16s2 and [Xe]4f96s2

c

 [Xe]4f76s2, [Xe]4f86s2 and [Xe]4f85d16s2

d

 [Xe]4f65d16s2, [Xe]4f75d16s2 and[Xe]4f96s2

answer is B.

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Detailed Solution


63Eu [Xe]4f76s2

64Gd[Xe]4f75d16s2 

65Tb[Xe]4f96s2

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The electronic configurations of Eu (AtomicNo. 63), Gd (Atomic No. 64) and Tb (AtomicNo.65) are :